Banana Dark Chocolate Muffins

I'm still craving muffins so today I made one that uses no milk or oils and it still turns out very moist.  Oh, I'm still craving chocolate too but that's a given.

Banana Dark Chocolate Muffins

1/4 cup butter, softened
1/3 cup dark brown sugar
2 bananas, mashed
1/2 tsp vanilla
1 large egg
1 cup flour
1/2 tsp baking powder
1/2 tsp baking soda
1/4 tsp salt

1/2 cup dark chocolate chips
1/2 tsp flour

Cream together butter and dark brown sugar.  Add in mashed bananas, vanilla and eggs.  Mix in dry ingredients.  In a small bowl, place the dark chocolate chips and toss them to coat with the 1/2 tsp flour.  This will keep them from sinking to the bottom of the muffins.  Bake for 18 minutes at 350°.